Archibald ttjkner and hugh james ttjbneb



A. AND H. J TURNER.

METHOD OF PRODUCING ENDLESS ELASTIC BANDS.

APPLICATION FILED OCT. 12. 1916.

1,319,770. Patented Aug.12,1919.,

UNITED STATES PATENT OFFICE.

ARCHIBALD TURNER AND-HUGH JAMES TURNER, OF LEICESTER, ENGLAND.

T l iiaiit it may concern Be it known that we, ARCHIBALD TURNER andI-IUGH JAMES TURNER, both subjects of.

the King of Great Britain, citizens of Leicester, England, residing at Leicester, in the .county-ofvLeic'ester, England, have invented new Land useful Improvements in Methods of 'Pfidub u lg Endless Elastic Bands, of which the following is a specification.

This invention relates to a new or im proved construction of endless elastic band, cord, and the like and to the method of pro- 'duci'ng'the same, and has particular reference to that type of band or cord adapted to withstand considerable tensilestrain or -to'act in the capacity of a shock absorber.

The objectof t endless elastic band capable of resisting wear to a maximum degree and with a minimum liability to. bollapse as the result of a fracture occurring in its external surface such as take lace with solid rubber bodies. j

The e astic band constructed according to the present invention comprises a core consisting of. a multiplicity'or .group "of thin elastic threads formed binding medium comprising a cover of one or more plies or layers ,of textile threads. In cases where a core of this character is formed according to this invention from a single thread or a number of threads b looping or coiling as aforesaid, the en s of the thread or threads isor are united by knot-' ting or tying and the point of-union or juncture is inserted between the mass of threads or coils prior to the covering being applied thereto so that no irregularity appears on the surface of the finished ban s and in addition the juncture is strengthened thereby in the support'it receives from the adjacent threads which surround it. 7

The multi-thread core thus formed is then stretched or subjected to considerable tensile strain by any convenient means and while in this condition it is coveredby the binding medium as for example, by braiding with strong textile threads, linen threads by the tensioning means and the covering Specification of Letters Patent.

e-invention is to produce an.

om either asingle cord of rubber thread wound, reeled, or formed into a series of loo s or coils and the,

are kept a .suitable distance apart.

METHOD orrnonucme muss miss-1c. BANDS.

thread covering should overlap sufficiently I Patented A 12, 1919. Application filed October 12, 1916. Serial No. 125,312.

threads fastened together anylwell known to (prevent any separation or gaping of the on s of the same occurring when the endless \band is subsequently submitted to anytensile strain which may be'as great asor greater than that at which the core was covered. For maximum efiiciencyit is ad-' visable that the textile thread covering should be oftwo or more plies-orthicknesses according to the. purpose for which the endless band is intended. Y

.To enable the invention to .be clearly understood a s ecific example of the method of" forming the improved endless elastic band will be described withreference to thediagrammatical views in the accompanying drawing,fwherein: Figure 1 is a side view 1 illustrating the method of winding the endless core; Fig. 2 is a front view 'ofthe frame and pulleys upon which the core is wound; Fig. 3 shows, in front and side elevation,

the device employed for stretching the end- I less core; Fig. 4 is a. side view showing the means for carrying the endless core in a stretched condltion while the outer textile covering is being formed about the same and Fig, 5 shows theendless band afte'f'the cover has beencompletedv and the tension released.

'Th multi-thread. core of the endless band may be very conveniently formed by the use of two grooved pulleys 1, 2 which b means of spindles 3 an a frame 4 (Fig. 2

frame 4 is placed upon the spindle 5 of a beaming machine (Fig. '1) and rotated as 'The indicated by the arrow the rubber thread 6 being mechanically let off by the. rollers 7,

8 at the desirable tension and wound about the pulleys 1, 2 forming as represented in the diagram a series of loops orcoils 9 extending from one pulley to the other.

Before commencing, to wind the rubber the first end is tied about the bar 10 of the frame 4 (Fig. 1), then when suihcient rubthe last end and the first end are tied to- I gether as shown at 11 (Fig. 2) thus completing the coils.

The pulleys carrying the wound rubber thread are now removed from the frame 4. for which purpose a device of the character shown in Fig. '3 may conveniently be em.-

ployed this comprising a pair of arms 12 pivotally connected at 13 and having at their free extremities notched jaws or bifurcations 14. The jaws are moved toward and'from each other by a double threaded screw 15, which engages nuts 16 in the arms. By engaging the spindles 3 by the notched jaws l4 and expanding the arms 12, the spindles 3 may be moved farther apart and removed from the frame 4, then by the same jaw device the said spindles 3 may be placed upon carriers 17 (Fig. 4) whereby the pulleys are supported in such a manner that the coils 9 are maintained in the tensioned condition and on one side pass through a braiding or other machine 18 of a suitable character for forming the covering about said coils.

Prior to forming the textile covering the union or juncture 11 of the rubber thread is pushed in among the mass of threads so as to become buried therein for the aforesaid purpose and then while the machine 19 forms the covering of textile threads about the coiled rubber threads 9 one of the pulleys is slowly rotated as for instance by a chain and chain wheel 20, 21 whereby the whole of the endless cord While maintained in the stretched condition, is drawn through the machine and receives av covering thereon. Any number of covering layers may be formed upon the endless core and in the case of a plurality of such these are formed one upon another by continuing to rotate the pulleys 1, 2 and so drawing the corecompletely through the machine'19 a number of times. In any case one end of the textile .covering 22 (Fig. 5) should overlap the other. For example if the covering 22 commences at the point 23 on the endless core it should be continued right around to somewhere about the point 24.

When covered the band may be removed from the machine by the aid of the jaw device and when removed from the pulleys it contracts and consists of a covered-endless band as represented in Fig. 5. The ends 25 of the textile thread may, after the cover has been bound around by a tight thread to prevent it running back, be cut short or stuck down and then covered by a piece of tape or some other suitable material by amp 7c wrapping this around the portion of the bandwhere the termination of the textile covering is situated, said tape being secured by stitches or by a suitable solution or adhesive. I

Instead of making the core 9 from a single cord of rubber thread by coiling the latter and joining its ends as described, the core may be composed of a number of such cords similarly dealt with, that is tosay, each cord of rubber thread is wound or coiled and its ends are secured together the whole of such-coiled threads combining to constitute a single core. The separate cords of rubber threads may be wound or coiled one after another on the pulleys l, 2 the ends of each cord being fastened together to form the endless coils.

Or the endless elastic core may be made by aggregating a multiplicity of endless rubber threads, cords or rings which when covered with the binding medium become compacted and bound together.

The specific example hereindescribed is not to be regarded as binding as it will be obvious that means and devices other than those referred to may be employed for carrying out the methods of winding. the core and covering the same while it is maintained in a stretched condition.

What we claim then is The method of producing an endless elastic band of the kind herein described, which consists in first forming an endless uniformly tensioned. elastic core by winding under tension a cord of elastic thread into a multiplicity of coils, joining the ends of the elastic cord, transferring said core while maintained under tension to a covering device, maintaining the core under tension in said device and covering the same with a binding medium of textile threads.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

ARCHIBALD TURNER, HUGH JAMES TURNER.

Witnesses:

E. N. LEWIS, Gannon Lns'rnn. 

